there is an electrical connector on the front of your master cylinder pull it off and short the connector see if it fixes the problem. If it does replace the switch.
The switch is a safety in the cruise system to turn it off w/ brake pressure. The switches have a rubber diaphragm in them that has been known to leak there are recalls on some ford vehicles to replace this switch due to fire b/c there is always power to this circuit.
Does the horn work? The connection in the steering wheel called the clockspring can go bad. There is one for the cruse, one for the horn, and one for the airbag. If one goes, usually the others do, but not always. There is a diagnostic ford can do to determine if the connection is good.
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